Question

08. (Mackenzie-SP) A massa total de uma mistura formada
por 15,0 g de água e 0,25 mol de glicose (C,H,O) será
Dados: C = 12; O = 16; H = 1.
A) 15,25 g.
E) 735 g
C) 60 g
D) 195 g.
B) 75 g.​

Answer 1

$Glicose: \ C_6H_{12}O_6\\\\M_{C_6H_{12}O_6} = 12 \cdot 6 + 12 + 16 \cdot 6\\M_{C_6H_{12}O_6} = 72 + 12 + 96\\M_{C_6H_{12}O_6} = 180g/mol\\\\m_{C_6H_{12}O_6} = M_{C_6H_{12}O_6} \cdot n\\m_{C_6H_{12}O_6} = 180 \cdot 0,25\\m_{C_6H_{12}O_6} = 45g\\\\m = m_{H_2O} + m_{C_6H_{12}O_6}\\m = 15g + 45g\\\boxed{m = 60g}$